Consider the following estimated trend models. Use them to make a forecast for t= 22.a. Linear Trend: ý = 12.42 + 1.13t (Round intermediate calculations to at least 4 decimal places and final answer to 2 decimal places.)b. Quadratic Trend: û = 18.04 + 1.04t - 0.02t2 (Round intermediate calculations to at least 4 decimal places and final answer to 2decimal places.)c. Exponential Trend: In(y) = 1.6 + 0.08t, se = 0.01 (Round intermediate calculations to at least 4 decimal places and final answer to2 decimal places.)

Answered: Consider the following estimated trend…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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An industry analyst fits a linear trend model to 2 years of monthly observations measuring the volume of retail sales (in millions of dollars) of passenger cars in the United States. The trend variable equals 1 in January 2017. Below is the equation and some supplementary info Y hat = 20.020 + 0.2093 t Se = 1.061 R2 = .6703 DW = 1.533 Estimate the number of passenger cars that will be sold in January of 2019.
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3-A geographer conducts a study of the relationship between the level of economic development of a nation measured in thousands of dollars for per capita GDP) and the birth rate (average number of children per adult woman). For one analysis of the data, a part of the computer printout reports Statistic Value SE Correlation -0.460 0.170 Explain how to interpret the reported value of the correlation. b. Can you tell whether the sign of the slope in the corresponding prediction equation would be positive or negative? Why? c. Suppose the prediction equation were ý=5.6-0.1x. Interpret the slope, and show how to find the predicted birth rate for a nation that has x= 40. d. Sketch a scatter plot for which it would be inappropriate to use the correlation to describe the association.

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